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Finding the Fourth Proportional to 1,188.77, 1,783.26 and 408.92

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Solution

The fourth proportional to 1,188.77, 1,783.26 and 408.92 is: 613.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,188.77 : 1,783.26 = 408.92 : x
  2. Step 2: Convert to fraction form
    1,188.77/1,783.26 = 408.92/x
  3. Step 3: Cross multiply
    1,188.77x = 1,783.26 × 408.92
  4. Step 4: Simplify right side
    1,188.77x = 729,201.76
  5. Step 5: Solve for x
    x = 729,201.76/1,188.77
  6. Step 6: Final answer
    x = 613.41

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.